Tourney is a $1k live WSOP bracelet event. 30 minute levels.

Effective stack is 60k hero covers w/75k

200-400-400, lvl just started. Table is 8 handed.
UTG+2 76hh RFI 800 (accident didn’t see blinds went up so raise was accidentally a min raise; meant to use a 2.2-2.3x sizing)
Button 3b to 2000. Folds to hero. Is this 100% a defend?

Also do you feel this a reasonable open or a marginal one at best, and why?

I think the open depends on how loose people are playing preflop, and I would think a live 1k with these stacks people are calling too wide and you'll go 4 way a lot here. Probably a fold pre - I think a call at this point to the 3b. Your hand is easy to play against a high card range and heavily disguised when you hit - much rather have this hand than AJo.

This open is marginal. Could be fine with the right table dynamics (a tighter table where you expect to either take down or gets heads up vs the blind a lot) and it could be bad (a table where this raise is often getting 2-3 callers).

Gotta peel the small 3bet and see a flop now.

This deep I like mixing in lowish suited connectors as opens from EP, even UTG. Mandatory defend to his 3!. If we hit the right board we can win a huge hand, but don’t get completely carried away with a flush.

I think open is a mix, vs a 3bet depends on reads, readless, I go with pop reads and usually those mean that 3bet is tight.

Open is fine as long as you open this <50% of the time.

You need to call 1,200 into a pot of 5,000 with a hand that can flop well and that villains will not easily expect to be in your EP open range. So yes, defend everytime.

GTO = open is 50% and 100% defend vs BTN 3b

Think I would lean fold here from said position but I don’t hate opening this hand. As long as you don’t open limp this, I say fold>raise>limp (which IMO you should open limp no hands ever in tournament poker).

Sizing- you are hella deep. At 150bb effective stacks, im opening 3x and never going 2.2-2.3x. Maybe it’s dumb but I think 2.2-2.3 is too easy to peal for people. Im more a fan of this open size when effective stacks are at say 40-60 bbs. I don’t think we want to keep pots super small when stacks are so deep honestly. I make it 3x with all hands I plan to open here (strength of hand should have no bearing on what size we open to here).

As played, think we call 3 bet and just play cautious post flop unless we flop a super strong draw with loads of equity. I would love to call this hand pre if button is say an omc or super nit that is likely raising super tight range and the type that will spew with kk or aa on a board where they have an overpair. I’m less likely to want to flat against a good aggro type player (euro, young internet kid etc) that will be 3betting correct and playing gto). We are going to get owned postflop by good players and they will be raising super wide so they may not pay us off when we smash a flop with a suited 76. Ala their range is going to be wide and they aren’t going to put chips in when behind.

This deep, I open sometimes and fold sometimes, leaning towards opening if I feel good about being one of the best players at the table. Any reads on button?

Unless you have a specific read that he 3-bets light a lot, or that this sizing is light and he'll fold to a 4-bet, I'd just call and play somewhat cautiously, only really driving the action if I hit two pair or better, or if I flop a straight flush draw and can put the last raise in on the flop.

I mostly open 76s/87s from EP in tournaments when we're 100BB+ effective. Our hand plays decently enough multi-way (which we'll go most of the time) but we do need to be cautious if a lot of money goes into the pot. The only time I'll make an adjustment away from that is if the table is super aggro or filled with strong players who are going to play well and/or 3-bet a lot. In that case, I'll tighten up my open ranges somewhat and 76s would probably be a fold.

I agree with the post above about sizing - when we're super deep, we want to be sizing up closer to 3x (think cash game sizing).

Clearly calling the button's 3-bet especially at that sizing, which is pretty suboptimal by the villain even in position.